SNMP access prolem

Hi Torti, Thank you! But i am confused why just only this Bigip 1500 has snmp access problem, The other 3 1500 is ok. version hardware is same. SNMP access test is ok, but when get SytemGroup, can't return a value. the other 3 1500 can return normal value. I found this 1500(standby) when i navigte to system-->services--->snmpd . I found snmpd service has many restarts . the other 1500(which is active) restarts is only 2 times. I can't found reason. because this box was replaced , we will replace this box for customer. Thank you! Junli